De Souza, A., D. García, L. Sueiro, L. Licea, and E. Porras. “Pre-Sowing Magnetic Treatment of Tomato Seeds: Effects on the Growth and Yield of Plants Cultivated Late in the Season”. Spanish Journal of Agricultural Research, Vol. 3, no. 1, Mar. 2005, pp. 113-22, doi:10.5424/sjar/2005031-131.